问题描述：
英语翻译
system based on rewards.Researchers at Harvard University in the United States and the Stockholm School of Economics in Sweden did the study.
They had about 200 college students play a version of the game known as the Prisoner's Dilemma.The game is based on the tension between the interests of an individual and a group.
The students played in groups pf four.Each player could win points for the group,so they would all gain epually.But each player in groups of four.Each player could win points for the group,ao they would all gain epually.But each player could also reward or punish each of the other three poayer,at a cost to the punisher.
system based on rewards.Researchers at Harvard University in the United States and the Stockholm School of Economics in Sweden did the study.
They had about 200 college students play a version of the game known as the Prisoner's Dilemma.The game is based on the tension between the interests of an individual and a group.
The students played in groups pf four.Each player could win points for the group,so they would all gain epually.But each player in groups of four.Each player could win points for the group,ao they would all gain epually.But each player could also reward or punish each of the other three poayer,at a cost to the punisher.
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